package com.heima.wemedia.gateway.filter;

import com.heima.wemedia.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.function.Consumer;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
  @Override
  public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
    // 1.获取request和response对象
    ServerHttpRequest request = exchange.getRequest();
    ServerHttpResponse response = exchange.getResponse();

    // 2.判断是否是登录
    if (request.getURI().getPath().contains("/login")) {
      // 放行
      return chain.filter(exchange);
    }

    // 3.获取token
    String token = request.getHeaders().getFirst("token");

    // 4.判断token是否存在
    if (StringUtils.isBlank(token)) {
      response.setStatusCode(HttpStatus.UNAUTHORIZED);
      return response.setComplete();
    }

    // 5.判断token是否有效
    try {
      Claims claimsBody = AppJwtUtil.getClaimsBody(token);
      // 是否是过期
      int result = AppJwtUtil.verifyToken(claimsBody);
      if (result == 1 || result == 2) {
        // 已经过期或者无效
        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        return response.setComplete();
      }
      // 解析token，获取用户id
      Object userId = claimsBody.get("id");
      // 将用户id存入请求头中
      ServerHttpRequest serverHttpRequest =
          request
              .mutate()
              .headers(httpHeaders -> httpHeaders.add("userId", userId.toString()))
              .build();
      // 重置header
      exchange.mutate().request(serverHttpRequest);

    } catch (Exception e) {
      e.printStackTrace();
    }

    // 6.放行
    return chain.filter(exchange);
  }

  /**
   * 优先级设置 值越小 优先级越高
   *
   * @return
   */
  @Override
  public int getOrder() {
    return 0;
  }
}
